fix: hide help command from TUI command list

The help command is CLI-only (agentcore help modes) and doesn't
make sense in the TUI since the TUI itself serves as the help
interface. Selecting it previously showed a TODO placeholder.

Fixes #236

Author: aidandaly24

src/cli/tui/utils/commands.ts

@@ -11,7 +11,7 @@ export interface CommandMeta {
 /**
  * Commands hidden from TUI help but still available via CLI.
  */
-const HIDDEN_FROM_TUI = ['update', 'package'] as const;
+const HIDDEN_FROM_TUI = ['help', 'update', 'package'] as const;
 
 /**
  * Commands hidden from TUI when inside an existing project.